Introduction

A German company based at Seevetal-Maschen (south of Hamburg), Kroll-Schifffahrt
GmbH is active in inland shipping transporting packaged goods, raw
materials, and heavy objects. Company
website, showing the house flag.
As the site tells us, Mr Günther Kroll bought his first barge in 1961.
A family business, ?Günther Kroll & Co.? received its current
name and form in 1979. Günther retired in 1994 and Horst, Barbara and Jan-Markus
Kroll now manage the firm.

Kroll-Schifffahrt GmbH
Brief history: The company was established as Günther Kroll & Co
and is located in Seevetal-Maschen just south of Hamburg, a little borough
with a big railway cargo station. On 13 January 1961 Kroll owned his first
ship, the MS HORST, having 400 tons. In 1974 Horst Kroll became co-owner.
In 1979 the company was renamed Kroll-Schiffahrt GmbH. In 1994 Günther
Kroll left the company, which is since then lead by Horst and Barbara Kroll.
In 2002 Jan-Markus Kroll joined the company. The main business is inland
shipping, especially the transport of building material. The company today
has a fleet of seven ships.
Source: Klaus-Peter Bühne; translated and trimmed by Klaus-Michael Schneider, 24 Apr 2009

Kroll flag#1

image by Ivan Sache, 29 Apr 2006

The house flag, a drawing of which is found here, is horizontally divided yellow-blue-yellow and has a blue-rimmed yellow disk in the centre bearing a blue initial "K". The disk slightly extends over the blue stripe.
On his site,
Holger Buhr shows the flag in action on a number of photos made by him, including one of the flagpole or beam pulled down with the flag still on it. Bargemen are nothing if not efficient!
Jan Mertens, 29 Mar 2006

Kroll flag#2

image by Klaus-Michael Schneider, 8 Apr 2009

This variant has a symmetric "K"-capital in its centre.
Source: based on an image of a table flag, sent by Klaus-Peter Bühne and an own photo shot on 17 April 2009 at Billwerder Bucht.
Klaus-Michael Schneider, 8 Apr 2009